Kvant Math Problem 361

Please provide the full text of Kvant problem M361 so I can write the complete, rigorous solution in the requested six-section format.

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Problem

The textual version of the problem statement is being prepared. The graphical version can be found in the published issue.

Please provide the full text of Kvant problem M361 so I can write the complete, rigorous solution in the requested six-section format.